Phaseolus salicifolius Piper (1926: 692) [clade B; sect. Paniculati Freytag].

TYPE: J González-Ortega 4065 (HOLOTYPE: US-1083789; isotype: MEXU n.v.).

A species still considered as endemic (its range seems to be the Sierra Madre Occidental along the border of the state of Sinaloa in pine-oak woodlands at 1300–2500 m, pending on more data (Fig. 8). The author has doubts that the specimen Ed Palmer 142 (K, US-571163) belongs to P. salicifolius (see Delgado-Salinas 1985, p. 215).

Specimens: MEXICO. Durango: DG Debouck 411 (K-1041820). Sinaloa: DE Breedlove 1689 (DUKE-157400).